Abstract

Megapterocheilus is an endemic North American subgenus of Pterocheilus. It contains 15 described species. one of them. nevadae. new. P. nevadae occurs in desert areas of Nevada. Arizona. and New Mexico. Since the most recent key to species is 55 years old. an up-to-date key is given. Four species names are newly placed in synonymy. peninsularis R. Bohart = arizonicus R. Bohart, bimaculatus Provancher = biplagiatus Cresson, inyoensis R. Bohart = nigricaudus R. Bohart, oregonensis R Bohart = quinquefasciatus Say.